Undercity Sewers (Borderless) (20) (PZA)
Non-Foil - NM
Not Buying
![Hall of Gemstone [Mirage]](https://cdn.shopify.com/s/files/1/0267/9501/6251/products/ea28c046-f8d2-59cd-b3e5-5d8a566d32be.jpg?v=1700205769)
Hall of Gemstone [Mirage]
| Set: | Mirage |
| Type: | World Enchantment |
| Rarity: | Rare |
| Cost: | 1GG |
| Colors: | G |
At the beginning of each player's upkeep, that player chooses a color. Until end of turn, lands tapped for mana produce mana of the chosen color instead of any other color.